I've installed the Axzez provided OS using Raspberry Pi Imager, and I have it hooked up to a monitor in HDMI port 0, and to a keyboard and mouse via USB ports. It's powered by the 24 pin connector from a Thermaltake PS-SPD-0500NPCWUS-W power supply. When the supply is turned on, nothing happens. I verified that the power supply seems to be working. What troubleshooting steps can I follow to try to diagnose and fix this issue?